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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/5429


    Title: 大屯火山群之三維速度構造;3-D Velocity Structure of the Tatun Volcanic Area
    Authors: 楊雅馨;Ya-Hsin Yang
    Contributors: 地球物理研究所
    Keywords: 速度構造;大屯火山群;Vp;seismic tomography;Tatun Volcanic Area
    Date: 2002-06-13
    Issue Date: 2009-09-22 09:53:50 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 位於台灣北端的大屯火山群,噴發活動停止於三十多萬年前。主要地質構造特徵為金山斷層與崁腳斷層,後火山活動之地熱、溫泉與地震多發生在兩斷層間。本研究利用1996~2001年大屯山K2及PANDA II微震網所收到的資料,挑選品質較佳的304個網內地震,共1872個P波、410個S波,在逆時針旋轉40度、間隔3 x 3公里的格點模型中,使用圓弧波線追跡法,加以重新定位震源與逆推地下速度分佈,所得結果為本區上部地殼之三維速度構造。結果顯示,本區之微震活動在監測的五年內維持穩定的發生頻率。震央分佈在磺嘴山至七星山間,成東北-西南走向。震源75%在地表五公里之內,由地表往下朝東南方傾斜,且分成往東北側與西南側的兩條地震帶﹔可能受到地熱活動、破碎地層與零星正斷層所影響。本區地層速度具有極大的側向與垂直變化。地表多反應火成岩體的高速與地熱噴氣所造成的低值﹔在七星山與大屯山下觀察到高速的管狀火山頸,自3及2公里深處傾斜上升﹔西北側之福德村至橫山村下有火成岩體自地底入侵,至地下3km處停止。竹子山-大屯山之下具有低速區塊,反應出受到火山餘熱加溫之流體填充於破碎地層交界帶,該低速帶向下延伸超過9公里深,且與溫泉地熱區的低速範圍相聯結。 The Tatun volcanic area is situated at the northern tip of Taiwan. Although the volcanic activity is now extinct, hydrothermal activity in the form of hot springs, high heat flow and earthquakes is still going on. In this study we have inverted P- and S-wave arrival times picked from 304 local earthquakes recorded by a local temporary network during the period of 1996-2001. The tomographic method we have used involves a 3-D circular ray tracing technique through a 3 x 3 km grid rotated at 40°. The results of this tomographic study indicate strong lateral velocity variations, with low velocity bodies probably representing zones of hydrothermal fluid circulation and high velocity areas representing solidified magmatic intrusions.
    Appears in Collections:[地球物理研究所] 博碩士論文

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